Electrically-heated glue-pot.



F. KUHN & F. E. SHAILOR.

ELECTRICALLY HEATED GLUE POT.

APPLICATION FILED APR. I2. I9I5.

1,170,170. Patented Feb. 1, 1916.

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`A UNITEDs'IATEs PATENT OFFICE.

TRANK KUHN ANI FRANK E. sHAILoR, or DETROIT, MICHIGAN, Ass'IeNoRs ToAMERICAN ELECTRICAL HEATER COMPANY, or DETROIT, MICHIGAN, A CoR-PoRATIoN or MICHIGAN.

To all whom t may concern.: v

Be it known that we, FRANK KUHN and FRANKfE. SHAILoR, citizens of theUnited States of America, residing at Detroit, in

the county of Wayne and State of Michigan,

have\ invented certain new and useful Improvements inElectrically-Heated Glue- Pots, of which the following is aspecification, reference being had therein. to the ac-l -companyingdrawings. t

The invention relates to heating'- apparatus of that'type in which thematerial to ,be heated is placedin an inner .vesselsurrounded by a waterchamber, through the medium of which the heat is' distributed andregulated. t A

' It is the object of the invention to obtain a construction adapted tobe electrically heated, and more particularly 'it is an object to obtaina lsimple and eiiicient construction .of apparatus for use as a gluepot. y

To this end the;l invention comprises the construction asherenafter setforth.

' In the drawings: Figure .1 is a vertical central section throughthe-apparatus; Fig. '2 isa bottom planvlew` of a portion of thewater-holding receptacle showing the elec-l tric heater applied thereto;and Fig. 3 is a;

section onl line w-:z: Fi 1.

A is an outer vessel ormed withbottom, side w-alls and preferably withsupporting legs B.

C is an inner vessel spaced from the walls and bottom of the outervessel A and having formed integral therewitha top Bange D.

This top iangev extends outward and is bolted or yotherwise secured tothe top of the' vessel A. There is also an inwardly-extending ange Ewhich yforms the support for 40 the innermost vessel F. Thus the threevessels A Gand F are arranged parallel to each other and are .connectedat the top,

f while the sides and bottoms are spaced. The

space Grk between the innermost vessel and .45 vesselfC forms the waterchamber, while the space H Ibetween the vessel'C and outer .'vessel Aforms a sealedair vchamber operatin as a heat-insulation.

o, equip this apparatus with electrical i heating means the vessel C hassecured to l its bottom, preferably 'cast therein, a series of studs I,'which are threaded for the fenga ment of nuts J.

' is an insulated electric heating unit Specicationvof LetterisIPatent.`l Application led April 12, 1915. i Serial No. 20,894.

- more, the housing T which incloses the insuseal with said boss.

Patented Febfl', 1916.

placed against the bottom of the vessel -C and clamped thereto by aheat-distributing plate L which is'secured by the studs I and- .nuts J.

M is an insulator block which is secured to the bottom of the'vessel C,and to which the terminals from the heating unit are led. Thisbloclrsupports the binding screws N, which are connected to theconductors O, the latter extending upward through the air space H andbeing insulated preferably by beads P strung thereon. The ange D .iscut-away 'at Q for the passage outward of these conductors, andaninsulator terminal block R is mounted upon the outer face of I the angefor connection with external flexible conductor cord S. T is a metallic:housing for the block R, which is secured to a boss U onfthe-lange D,preferably with a gaslket V therebetween to form a liquid-tight sea Withthe construction described, the elecp trical part of the apparatus isthoroughlyyprotected where there can be no danger of short circuitingfrom any cause, such for instance as the .boiling over of the ot. Thisis due to the fact that the vessel is imperfora-te, and as it is formedintegral with the' fiangeD there is no opportunity for leakage of waterinto the chamber II. Further-K 85 lator terminal block R has a.liquid-'tight joint with the boss U on the flange I), and as thishousing extends up above the rim of the pot it will exclude water fromthe terminals. t Y

What we claim asour invention iss- 1. The combination with a vessel forholding liquid to be heated, of an outwardlyextending lange integralwith said vessel, an outer casing surrounding said vessel and secured'tosaid flange, an electric heater se- .cured to the bottom of said vesselin the space between the same and the bottom of the outer casing,terminal connections for said heater passing outward through an aperturein said flange, said flange bein provided with a boss anda housing forsai terminal connections secured to said boss and above said flangeforming a liquid-tight 2. The combination with a vessel for containingliquid to be heated, of an outwardlyextending flange integral with saidvessel at the upper end thereof, an outer casing surrounding said vesseland spaced therefrom,

secured to the under face of said outwardlyextending ange, an electricheater clamped tothe bottom of said vessel and housed in the spacebetween the same and the bottom of the outer casing, terminal connectorspassing from said heater upward through the space between the same andthe outery case and 4outward through an aperture in said flange, aninsulator block mounted on said flange through which said terminallconnectors pass, and a housing of inverted cup-shaped form inclosingsaidinsulator block and secured to said flange with a liquid-tight seal.

3. The combination with a vessel havingintegral'with its upper end anoutwardly and inwardly extending annular flange, a casing surroundingsaid vessel and spaced therefrom, secured at its upper end to saidoutwardly-extending flange, an inner vessel supported upon said inwardlyextending flange and depending within said rstmentioned vessel, studsdepending from the bottom of said first-mentioned vessel, an electricheater clamped to the bottom of said vessel by said studs, terminalconnections from said heater passing upward through Limit/o the spacebetween said vessel and outer casing and outward through an aperture insaid outwardly-extending flange, a terminal block above said ange, and a`housing for inclosing said terminal block mounted upon said flange,forming a sealing joint there'- with.

4C. 'lhe 'combination with a vessel having integral with its upper endan outwardly c and inwardly extending annular flange, a casingsurrounding said vessel and spaced therefrom, secured at its upper endto said HARRY W. Leren, @scan A.. Esamina.

` outwardly-extending flange, an` inner vessel

